"Fruitiest of Fruitcakes" wrote in message
news.com...

Why would a mass extinction necessarily be €˜mysterious?

If it wiped out a developing civilisation and the planet burned for a few
years; there would be little evidence left.

But we humans are tough:

https://en.wikipedia.org/wiki/Toba_catastrophe_theory

https://www.smithsonianmag.com/smart...ine-180968479/

https://www.sciencealert.com/humanit...a-supervolcano